Missing Information:
RMS Wattage of the amp
How many channels on the amp
The 2400 doesnt mean much. You have to find the RMS wattage of the amp. Its probably about 500 watts at 4 ohm. And its probably at least a 2 channel, so each channel is 250 watts RMS. Your speaker is 150 watts RMS (again ignore the 300 peak rating). So it sounds like you're amp is ok, or a little bit strong for your subwoofer. You could just turn down the gain and have to problem.